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  1. By: Mulliner, D K - Sphon, G G
    Type: Article
    In: Transactions of the San Diego Society of Natural History
    Volume: 17
    Date: 1974
    Page Range: 209--216
    Publication Info: [San Diego], The Society, 1905-1989
  2. By: Sphon, G G - Mulliner, D K
    Type: Article
    In: The veliger
    Volume: 15
    Date: 1972
    Page Range: 147--152
    Publication Info: Berkeley, CA, California Malacozoological Society,